US4298128A - Movable support for rotatable extend/retract screw in telescopic crane boom - Google Patents
Movable support for rotatable extend/retract screw in telescopic crane boom Download PDFInfo
- Publication number
- US4298128A US4298128A US06/122,488 US12248880A US4298128A US 4298128 A US4298128 A US 4298128A US 12248880 A US12248880 A US 12248880A US 4298128 A US4298128 A US 4298128A
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- US
- United States
- Prior art keywords
- screw
- thread
- boom
- section
- telescopic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/706—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by other means
Definitions
- This invention relates generally to multisection telescopic crane boom having a rotatable screw for extending and retracting boom sections and, in particular, to movable support means for the screw.
- U.S. Pat. No. 3,836,011 discloses a telescopic or extensible crane boom of a type wherein two boom sections are moved relative to each other by means of an elongated hydraulic cylinder unit disposed within the boom.
- a buckling-preventing support for the hydraulic cylinder unit is employed in the boom wherein an intermediate position of an optionally extendible piston-rod of the cylinder unit is always supported with a buckling-preventing support having legs slideably or rotatably engaged with inner circumference of a boom member.
- That patent further discloses driving means for the buckling-preventing device which moves the device to said intermediate position of the piston-rod in connection with the operation of the cylinder unit.
- a multisection telescopic boom having at least one inner boom section telescopically receivable within an outer hollow boom section; an elongated screw rotatably mounted on the outer boom section by a screw mount and having a first thread thereon engaged with a first nut mounted on the inner boom section whereby screw rotation effects telescopic movement of the inner boom section; drive means for selectively rotating the screw in opposite directions; and adjustably movable support means for supporting the screw intermediate its ends on the outer boom section.
- the adjustably movable support means includes a second thread of smaller lead and lesser depth superimposed on the first thread of the screw and engaged with a second nut mounted on a support member which is located between said screw mount and second nut and which is movably supported on the outer boom section, preferably by means of rollers, whereby screw rotation also effects axial movement of the second nut and support member at a slower rate than the telescopic movement of the boom sections so as to position the support member intermediate the length of the screw.
- the adjustably movable support means in accordance with the invention is particularly well adapted to support elongated screws used instead of hydraulic cylinder units in telescopic booms.
- the support provides more anti-buckling strength to the screw thereby allowing for use of a lighter screw for the required column load.
- the movable support automatically positions itself at or near the mid-portion of the screw to effect optimum support thereof regardless of boom section position.
- the support is constructed and operates to position itself with a minimum number of parts or components and is relatively easy and economical to fabricate and fool-proof in operation. Other objects and advantages of the invention will hereafter appear.
- FIG. 1 is a side elevational view of a multisection telescopic crane boom having a movable support for a rotatable extend/retract screw therein in accordance with the invention and showing the boom retracted;
- FIG. 2 is a view similar to FIG. 1 but showing the boom extended
- FIG. 3 is an enlarged side elevational view of a portion of the screw shown in FIGS. 1 and 2;
- FIG. 4 is an enlarged cross-sectional view of the screw taken on line 4--4 of FIG. 3.
- the numeral 10 designates a telescopic crane boom in accordance with the invention which is understood to be adapted for mounting on the rotatable upper section of a mobile crane (not shown), as by means of a trunnion 11 at its base end and which is further understood to be pivotable in a vertical plane about trunnion 11 between raised and lowered positions by means of a hydraulic lift cylinder 13 which is pivotably connected to an attachment bracket 14 on the boom.
- Boom 10 comprises a hollow base section 15, a hollow intermediate section 16 slideably and telescopically receivable within base section 15, and a hollow fly section 17 slideably and telescopically receivable within intermediate section 16.
- FIGS. 1 and 2 show the boom 10 fully retracted and fully extended, respectively.
- sections 15 and 16 are referred to as an "outer” section relative to “inner” sections 16 and 17, respectively.
- Means are provided to telescopically move intermediate section 16 relative to base section 15 and such means comprise an elongated rotatable screw 20 which is rotatably supported at its base end by and connects to rotatable shaft 21 of a conventional reversible hydraulic motor 22 which is rigidly supported by means of a motor mount 23 on or near the base end of base section 15.
- screw 20 is provided therealong with a continuous first or primary thread 25 of predetermined lead and depth.
- First thread 25 threadedly and rotatably engages a first nut or threaded member 26 which is rigidly and non-rotatably supported, as by welding or other suitable means, on or near the base end of intermediate section 16.
- rotation of shaft 21 of motor 22 effects rotation of screw 20 and first thread 25 relative to nonrotatable first nut 26, and this in turn causes axial sliding relative movement of "inner" intermediate section 16 relative to stationary base section 15, such movement being in the extend or retract direction depending on the direction of rotation of motor shaft 21.
- Adjustably movable support means are provided for supporting screw 20 intermediate its ends on the "outer" or base section 15.
- Such means comprise a second or secondary thread 30 of smaller lead and lesser or shallower depth than first thread 25 which is superimposed on first thread 25, as FIG. 3 and 4 best show.
- primary thread 25 has a lead of 3" and a depth of 0.15" and secondary thread 30 had a lead of 1.5" and a depth of 0.050".
- secondary thread 30 has a lead equal to half the lead of primary thread 25.
- Secondary thread 30 threadably and rotatably engages a second nut or threaded member 36 which is non-rotatably mounted on or integral with a support member 37 which is located between the motor 22 on base section 15 and first nut 26 on intermediate section 16.
- Support member 37 is supported for axial movement relative to base section 15 on the floor 38 of base section 15 by means of a roller or wheel 40 rotatably mounted at the lower end of the support member 37.
- a roller or wheel 40 rotatably mounted at the lower end of the support member 37.
- an upper roller or wheel 41 is rotatably mounted at the upper end of support member 37 and engages the top side 39 of base section 15 so as to guide, stabilize and prevent "window-locking" of secondary nut 36 on screw 20.
- rotation of screw 20 effects rotation of secondary thread 30 relative to non-rotatable second nut 36 and this in turn causes axial sliding relative movement of nut 36 and the attached support member 37 relative to stationary base section 15, such movement being in the extend or retract direction, depending on the direction of rotation of screw 20, at half the speed of the movement of boom section 16 relative to base section 15.
- support member 37 is automatically positioned at or near the mid-point of that portion of screw 20 between motor shaft 21 and first nut 26, thus ensuring that screw 20 is supported from below at the optimum intermediate location.
- FIGS. 3 and 4 show, because of a slight difference in pitch diameters between threads 25 and 30, a slight error difference results in the length of travel of nut 26 relative to nut 36 but this can be compensated for by initially locating support member 37 in an appropriate location.
- means are also provided to telescopically move fly section 17 relative to intermediate section 16 and such means comprise an elongated rotatable screw 20A, a hydraulic motor 22A, a first thread 25A and a second thread 30A superimposed thereon, a first nut 26A, a second nut 36A, and a wheeled support member 37A.
- These last recited components having the suffix letter "A" are constructed and operate in the same manner as similarly numbered components without the suffix letter, hereinbefore described.
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/122,488 US4298128A (en) | 1980-02-19 | 1980-02-19 | Movable support for rotatable extend/retract screw in telescopic crane boom |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/122,488 US4298128A (en) | 1980-02-19 | 1980-02-19 | Movable support for rotatable extend/retract screw in telescopic crane boom |
Publications (1)
Publication Number | Publication Date |
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US4298128A true US4298128A (en) | 1981-11-03 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US06/122,488 Expired - Lifetime US4298128A (en) | 1980-02-19 | 1980-02-19 | Movable support for rotatable extend/retract screw in telescopic crane boom |
Country Status (1)
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US (1) | US4298128A (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4394912A (en) * | 1980-11-07 | 1983-07-26 | Harnischfeger Corporation | Mobile crane having telescoping outriggers and power operated screw means for same |
US4883186A (en) * | 1987-10-28 | 1989-11-28 | Werber Manuel M | Easy erecting telescopic mast |
EP0488990A1 (en) * | 1992-02-01 | 1992-06-03 | Krupp Industrietechnik Gmbh | Telescopic jib with single screw actuator |
US5509502A (en) * | 1994-05-04 | 1996-04-23 | Skyline Displays, Inc. | Construction elevator |
US6026970A (en) * | 1999-03-11 | 2000-02-22 | Par Systems, Inc. | Telescoping tube assembly |
US20030120301A1 (en) * | 1986-04-15 | 2003-06-26 | Yock Paul G. | Angioplasty apparatus facilitating rapid exchanges and method |
US20040104239A1 (en) * | 2002-10-04 | 2004-06-03 | Black Talbert James | Vending machine dispensing system |
DE202004019021U1 (en) * | 2004-12-08 | 2006-04-20 | Liebherr-Werk Ehingen Gmbh | Telescopic system for mobile crane, comprises two telescopic armatures made out of hollow profiles, and screws centrally driven by means of central motor |
WO2008103418A2 (en) * | 2007-02-22 | 2008-08-28 | Roy Sandberg | Method and apparatus for panning, tilting, and adjusting the height of a remotely controlled camera |
US20080237172A1 (en) * | 2007-03-30 | 2008-10-02 | Daihen Corporation | Transfer apparatus |
US20100040452A1 (en) * | 2008-07-29 | 2010-02-18 | Egan Thomas F | Power lift and transfer system and method |
CN102674163A (en) * | 2012-05-22 | 2012-09-19 | 王辉 | Small multi-purpose crane |
CN104444861A (en) * | 2014-12-10 | 2015-03-25 | 郑敏 | Speed-adjustable telescopic arm |
US9217535B1 (en) | 2013-02-21 | 2015-12-22 | Thomas F. Egan | Portable lifting and transferring techniques |
US9937968B2 (en) | 2015-07-13 | 2018-04-10 | Michael Goren | Stackable vehicle |
US10202141B2 (en) | 2015-07-13 | 2019-02-12 | Hurdler Motors | Vehicle, vehicle drive assembly and vehicle steering assembly |
WO2019159994A1 (en) * | 2018-02-16 | 2019-08-22 | 株式会社タダノ | Crane |
WO2019159993A1 (en) * | 2018-02-16 | 2019-08-22 | 株式会社タダノ | Crane |
JP6635244B1 (en) * | 2019-03-14 | 2020-01-22 | 株式会社タダノ | Telescopic devices and cranes |
WO2021033772A1 (en) * | 2019-08-21 | 2021-02-25 | 株式会社タダノ | Work machine |
WO2021033771A1 (en) * | 2019-08-21 | 2021-02-25 | 株式会社タダノ | Work machine |
US11453578B1 (en) | 2019-09-11 | 2022-09-27 | Oz Lifting Products, LLC | Telescoping crane and related methods |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3174634A (en) * | 1961-02-08 | 1965-03-23 | U S Ind Inc Engineering Ltd | Telescopic multi-purpose lifting unit |
US3800965A (en) * | 1972-01-11 | 1974-04-02 | H Pavone | Ladle skimming mechanism |
US3836011A (en) * | 1970-01-31 | 1974-09-17 | T Sakamoto | Extensible boom |
US4169338A (en) * | 1976-09-03 | 1979-10-02 | A/S Normar | Telescopic boom |
-
1980
- 1980-02-19 US US06/122,488 patent/US4298128A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3174634A (en) * | 1961-02-08 | 1965-03-23 | U S Ind Inc Engineering Ltd | Telescopic multi-purpose lifting unit |
US3836011A (en) * | 1970-01-31 | 1974-09-17 | T Sakamoto | Extensible boom |
US3800965A (en) * | 1972-01-11 | 1974-04-02 | H Pavone | Ladle skimming mechanism |
US4169338A (en) * | 1976-09-03 | 1979-10-02 | A/S Normar | Telescopic boom |
Cited By (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4394912A (en) * | 1980-11-07 | 1983-07-26 | Harnischfeger Corporation | Mobile crane having telescoping outriggers and power operated screw means for same |
US6921411B2 (en) | 1986-04-15 | 2005-07-26 | Advanced Cardiovascular Systems Inc. | Angioplasty apparatus facilitating rapid exchanges and method |
US20030120301A1 (en) * | 1986-04-15 | 2003-06-26 | Yock Paul G. | Angioplasty apparatus facilitating rapid exchanges and method |
US4883186A (en) * | 1987-10-28 | 1989-11-28 | Werber Manuel M | Easy erecting telescopic mast |
EP0488990A1 (en) * | 1992-02-01 | 1992-06-03 | Krupp Industrietechnik Gmbh | Telescopic jib with single screw actuator |
US5509502A (en) * | 1994-05-04 | 1996-04-23 | Skyline Displays, Inc. | Construction elevator |
US6026970A (en) * | 1999-03-11 | 2000-02-22 | Par Systems, Inc. | Telescoping tube assembly |
US20090037019A1 (en) * | 2002-10-04 | 2009-02-05 | Black Jr Talbert James | Vending machine dispensing system |
US7401710B2 (en) * | 2002-10-04 | 2008-07-22 | Dixie-Narco, Inc. | Vending machine dispensing system |
US8132691B2 (en) | 2002-10-04 | 2012-03-13 | Crane Merchandising Systems, Inc. | Vending machine dispensing system |
US20040104239A1 (en) * | 2002-10-04 | 2004-06-03 | Black Talbert James | Vending machine dispensing system |
DE202004019021U1 (en) * | 2004-12-08 | 2006-04-20 | Liebherr-Werk Ehingen Gmbh | Telescopic system for mobile crane, comprises two telescopic armatures made out of hollow profiles, and screws centrally driven by means of central motor |
WO2008103418A2 (en) * | 2007-02-22 | 2008-08-28 | Roy Sandberg | Method and apparatus for panning, tilting, and adjusting the height of a remotely controlled camera |
WO2008103418A3 (en) * | 2007-02-22 | 2009-12-30 | Roy Sandberg | Method and apparatus for panning, tilting, and adjusting the height of a remotely controlled camera |
US20080237172A1 (en) * | 2007-03-30 | 2008-10-02 | Daihen Corporation | Transfer apparatus |
US7946799B2 (en) * | 2007-03-30 | 2011-05-24 | Daihen Corporation | Transfer apparatus |
US9526663B2 (en) | 2008-07-29 | 2016-12-27 | Egan Thomas F | Power lift and transfer system and method |
US8540474B2 (en) * | 2008-07-29 | 2013-09-24 | Thomas F. Egan | Power lift and transfer system and method |
US20100040452A1 (en) * | 2008-07-29 | 2010-02-18 | Egan Thomas F | Power lift and transfer system and method |
CN102674163B (en) * | 2012-05-22 | 2013-12-25 | 王辉 | Small multi-purpose crane |
CN102674163A (en) * | 2012-05-22 | 2012-09-19 | 王辉 | Small multi-purpose crane |
US10443783B1 (en) | 2013-02-21 | 2019-10-15 | Thomas F. Egan | Portable lifting and transferring techniques |
US9217535B1 (en) | 2013-02-21 | 2015-12-22 | Thomas F. Egan | Portable lifting and transferring techniques |
US11293588B1 (en) | 2013-02-21 | 2022-04-05 | Thomas F. Egan | Portable lifting and transferring techniques |
US10837598B1 (en) | 2013-02-21 | 2020-11-17 | Thomas F. Egan | Portable lifting and transferring techniques |
CN104444861A (en) * | 2014-12-10 | 2015-03-25 | 郑敏 | Speed-adjustable telescopic arm |
US10633016B2 (en) | 2015-07-13 | 2020-04-28 | Hurdler Motors, Inc. | Vehicle, vehicle drive assembly and vehicle steering assembly |
US10202141B2 (en) | 2015-07-13 | 2019-02-12 | Hurdler Motors | Vehicle, vehicle drive assembly and vehicle steering assembly |
US9937968B2 (en) | 2015-07-13 | 2018-04-10 | Michael Goren | Stackable vehicle |
WO2019159994A1 (en) * | 2018-02-16 | 2019-08-22 | 株式会社タダノ | Crane |
JP2019142621A (en) * | 2018-02-16 | 2019-08-29 | 株式会社タダノ | crane |
JP2019142620A (en) * | 2018-02-16 | 2019-08-29 | 株式会社タダノ | crane |
WO2019159993A1 (en) * | 2018-02-16 | 2019-08-22 | 株式会社タダノ | Crane |
WO2020183686A1 (en) * | 2019-03-14 | 2020-09-17 | 株式会社タダノ | Expansion device and crane |
CN113614018A (en) * | 2019-03-14 | 2021-11-05 | 株式会社多田野 | Telescopic device and crane |
JP6635244B1 (en) * | 2019-03-14 | 2020-01-22 | 株式会社タダノ | Telescopic devices and cranes |
CN113614018B (en) * | 2019-03-14 | 2024-03-08 | 株式会社多田野 | Telescoping device and crane |
WO2021033772A1 (en) * | 2019-08-21 | 2021-02-25 | 株式会社タダノ | Work machine |
WO2021033771A1 (en) * | 2019-08-21 | 2021-02-25 | 株式会社タダノ | Work machine |
JP2021031221A (en) * | 2019-08-21 | 2021-03-01 | 株式会社タダノ | Work machine |
JP2021031220A (en) * | 2019-08-21 | 2021-03-01 | 株式会社タダノ | Work machine |
JP7275994B2 (en) | 2019-08-21 | 2023-05-18 | 株式会社タダノ | work machine |
JP7279579B2 (en) | 2019-08-21 | 2023-05-23 | 株式会社タダノ | work machine |
US11926512B2 (en) | 2019-08-21 | 2024-03-12 | Tadano Ltd. | Work machine |
US11453578B1 (en) | 2019-09-11 | 2022-09-27 | Oz Lifting Products, LLC | Telescoping crane and related methods |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HARNISCHFEGER CORPORATION, W. MILWAUKEE, WIS. A CO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GATTU NARAHARI;REEL/FRAME:003860/0911 Effective date: 19800211 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: CENTURY II, INC., MAYFAIR ATRIUM BUILDING, 10400 W Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HARNISCHFEGER CORPORATION, A CORP. OF DE;REEL/FRAME:004969/0781 Effective date: 19880429 Owner name: CENTURY II, INC., A CORP. OF DE, WISCONSIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HARNISCHFEGER CORPORATION, A CORP. OF DE;REEL/FRAME:004969/0781 Effective date: 19880429 |
|
AS | Assignment |
Owner name: CENTURY II INC., A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HARNISCHFEGER CORPORATION, A DE CORP.;REEL/FRAME:005578/0172 Effective date: 19910130 |
|
AS | Assignment |
Owner name: TRUST COMPANY, UNITED STATES, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PPM CRANES, INC.;REEL/FRAME:007838/0344 Effective date: 19950509 |